NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 8$ 



turn. The postnuclear whorls are well rounded and angulated at 

 the periphery. The summit of succeeding whorls falls at a little 

 distance below the peripheral angulations, which lets the suture ap- 

 pear deeply channeled. The base is strongly rounded, hemispherical, 

 and openly umbilicated. The entire surface of spire and base is 

 crossed by many very finely closely spaced striations. The aperture 

 is oval ; the columella is slender, slightly curved, and bears an internal 

 fold opposite the umbilicus; the parietal wall is covered by a heavy 

 callus that renders the peristome complete; the outer lip is thin and 

 gently curved. 



The type, U.S.N.M. No. 561673, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.2 whorls and measures : Length 2.2 mm., 

 diameter i.o mm. 



The deeply channeled suture will readily distinguish this species 

 from Odostomia (Evalea) caloosaensis (Dall). 



The species is named for Lawrence Pomeroy, one of St. Petersburg's 

 moUuscan enthusiasts. 



ODOSTOMIA (EVALEA) CALOOSAENSIS (Dall) 



Plate 17, figure 4 



1892. Odontostomia (^Syrnola) caloosaensis Dall (part), Trans. Wagner Free 

 Inst. Sci., vol. 3, pt. 2, p. 252, pi. 15, fig. 12b. (Dr. Dall here gives 

 a complete description of things from many places, but the name and 

 figure indicate this Pliocene species to be from the Caloosahatchie beds, 

 so we here restrict it.) 



Shell very elongate-ovate or narrowly conic, umbilicated, cream- 

 yellow. The nucleus is small and obliquely immersed in the first of 

 the postnuclear whorls. The postnuclear whorls are well rounded with 

 a decidedly raised peripheral spiral thread. The summit of succeeding 

 whorls adjoins this cord and leaves the suture less conspicuous than 

 in Odostomia {Evalea) pomeroyi. Base hemispherical and openly 

 umbilicated. The entire surface of the spire and base are marked by 

 many fine incised spiral lines. The aperture is ovate; the columella 

 is slender and gently curved and bears a weak internal fold a little 

 below its insertion; the parietal wall is covered by a weak callus; 

 the outer lip is gently curved and thin. 



The specimen described and figured, U.S.N.M, No. 561674, comes 

 from the Pliocene of North St. Petersburg, Fla. It has 6.1 post- 

 nuclear whorls and measures: Length 3.0 mm., diameter i.i mm. 

 An additional specimen from the same source is in the collection of 

 the A.N.S.P. 



